[gdal-dev] using NaN as no-data value

[Javier Jimenez Shaw]

Hi

I have seen some GeoTIFFs for DSMs (float32) with NaN as no-data value. It
was not set in the metadata, but worked as that. I think I have also seen
it with NaN set in the metadata.
Also many other numbers as no-data value, like -10000 or -9999 or -8888
(yes, and many other posible values).

Is there any reason to prefer or discourage NaN as a no-data value for a
float32 GeoTIFF?

Thank you
Javier
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